Sewing-machine



(No Model.) 2 Sheets-Sheet 1. P. LIGHTFELDT.

SEWING MACHINE.

Patented June 28, 1892.

(No Model.) 2 Sheets-Sheet 2.

F. LIGHTFELDT. SEWING MACHINE Patented June 28,1892.

Wikmcom UNTTE STATES PATENT OFFICE.

FREDRICK LICHTFELDT, OF MILWAUKEE, \VISCONSIN.

SEWING-MACHINE.

SPECIFICATION forming part Of Letters Patent No. 78,063, dated June 28, 1892.

Application filed September 14, 1889. fierial No. 323,975. (No model.)

To all whom it may concern.-

Belt known that I, FREDRICK LICHTFELDT, a citizen of the United States, residing at 674 'Walker street, in the city and county of Milwaukee and State of \Visconsin, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to improvements in sewing-machines, and more in particular to the stitch-forming mechanism,which improvements are fully set forth in the following specification and will finally be pointed out in detail in the claims.

The object of my invention is to produce a machine consisting of a fewer number of parts, possessing greater durability, and costing less to manufacture than those in common use.- I attain these objects by the mechanism illustrated in the accompanying drawings, which are made a part of these specifications.

Figure 1 is an end view of a portion of a sewing-machine embodying my. invention. The parts of a sewing-machine unnecessary to the explanation of my invention are omitted from the drawings, as my invention is ap plicable to sewing-machines of well-known forms. Fig. 2 is a side elevation of my invention with the feeder, throat-plate, and a part of the bed-plate shown in section. Fig. 3 is a sectional side elevation of the bobbincasc, revolving hook and shaft, and the swinging guard, and is cut bya vertical plane passing through the center of each of these parts. Fig. 4 is a view of the feeder-guide pin and stud. Fig. 5 is a perspective View of a portion of the feeder and circular tension-spring detainer. Fig. 6 is a perspective view of the revolving hook and feed-cam and a portion of its shaft. Fig. 7 is a perspective view of the bobbin-case with its tension-spring in its place. Fig. 8 is an edge View of the bobbincase, showing the opening for the needle and the inlet for the tension-spring. Fig. 9 is a perspective view of the self-fastening circular tension-spring. Fig. 10 is a section cut on line 3 and y, Fig. 12, and showing the throat-plate, a portion of the bed-plate, also the female screws 0 and c with male screws 0 and c. In this View the throat-plate is shown elevated above the upper surface of the bed-plate. Fig. 11 is the same view as Fig. 10, with this exception, that the throatplate is shown below the upper surface of the bed-plate. plate.

-' Similarletters and numerals refer to similar parts throughout the several views.

: A is the bed-plate.

a is a stud formed upon the bed-plate which constitutesa bearing for one end of the bobbin-carrier shaft, and a is the bobbin-guard stud. The working space B (shown in Figs. 1 and 2) is an opening in the bed-plate, which has formed around its upper edge a recess for the reception of the throat-plate C. The throat-plate C is secured in its place by means of screws 0 and c passing down through the throat-plate C, and into the upper end or female portion of diiferential screws 0 and 0 as shown in Figs. 11 and 12. Differential screws 0 and c are throat-plate-regulating screws with threads upon their outer surfaces and have corresponding threads in the holes in the bed-plate through which they pass. By loosening screws 0' and c and turning screws and 0 into the bed-plate the throat-plate G will be raised above the upper surface of the bed-plate A, as shown in Fig. 11, and which serves to adjust the throat-plate in its relation to the feeder D. In order to lower the throat-plate C, the screws 0' and c are slightly withdrawn. The difierential screws 0 and c are then unscrewed until the throat-plate is in position, as shown by dotted lines, under the throat-plate and the heads of male screws 0 and c, as shown in Fig. 1. The screws 0' and c are then tightened, which secures the throatplate. Screw c is provided with a nut a, which serves to adjust the feeder D in a vertical direction, and also serves with screw 0 as a guide for slide-bar d.

Feeder D is composed of the following elements, as will be seen by referring to Figs. 1 and 5: The usual part which passes up through the throat-plate C, the horizontal part directlybeneath the throat-plate, which serves as a working surface and which operates the feeder in a vertical direction by the revolution of the feed-cam H, the vertical part (1 which also constitutes a working surface and which by the revolution of the feed-cam H Fig. 12 is aplan view of the throat- 30 the throat-outlet in the bobbin-case I.

[ Fig. 1, against feeder-spring seat D, in which feeder-spring e is fastened, and pulling toward the feeder-guide pin 6', where it is fastened on the other side, as shown in Figs. 1 aud t, by a groove cut in the threaded 1 seat of the stitch-regulating screw E.

E is a stud projecting from the-lower side of the bed-plateA and forms asupport for the feeder-guide pin 6. Feeder-guide pin 6 is provided with-a flange e and is adjusted and secured inits seat in stud E by set-screw a as shown in Fig. 4. The presser-foot F is fastened to thepresser-foot bar F by a thumbnut, as shown in Fig. 1.

G is the usual reciprocating needle-bar and 2 5 is provided with ashort eye-pointed needle g,

as shownin Fig. 1.

The bobbin-case I has a self-fastening circular tension-spring I (separately shown in Fig. 10) with projections that pass upthrough The extensions 1 serve to secure the tension-sprin g in its place in the bobbin-case and also as a guide for the'thread' as it is delivered from the bobbin. The bobbin-case when placed in 5 the machine is-held-in place by the swinging guard J The protection-fold '2" in tensionspring extensions to circular tension-spring I is produced byfolding-one-piece in theother, as shown in Fig. 10, and preventsthe thread 40 that comes from the bobbin K,which is placed on. the bobbin-stud i in the bobbin-case I, from slipping out of its proper place.

The bobbin-case is put in the machine with the open side-toward the bobbin-case guard J.

The operation of my device is as follows: The threaded needle which isshownin Fig. 1 at its highest point, passesdown through the hole in the throat-plate, and when: in position, asshown'in Figs. 2 and 3, the thread is caught by the revolving hook it and carried down and around the bobbin-case I, and by means of sloth, Fig. 7, the-loop is caused to pass back of the flange and bobbin-case carrier 1' upon the shuttle, and from this pointthe-thread is brought up through the hole inthe throat-plate-C by thetake-up, which is not shown in the drawings,-but may be of anyofthe usual forms; As theneedle g movesupward above the presser-foot the revolvinghookz' ,withits cam,which'revolves' F. The feederD in turn is retracted by means of the coil-spring c.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in a sewing-machine, with the stitch-forming mechanism, of a bedplate having a recess for the reception of the throat-plate, a throat-plate provided with a slot for the passage of the feeder and secured in said recess by means of screws 0 and c, passing into the upper ends, respectively, of the difierential screws 0 and 0 the differential screws 0 and c passing up through the bed- -plate and adapted to adjust the throat-plate in a vertical direction with reference to the 'upper surface of the bed-plate and to the feeder, as shown and described.

, 2. The combination, in a sewing-machine, with the stitch-forming mechanism, of a revolving hook having an internal peripheral figroove, a bobbin-case formed of two trunlcated'cones, their bases meeting in a flange,

and the extension of the circular tensionspring, a circular tension-spring adaptedto fit in said bobbin-case, having an extension projecting into a suitable bearing in the feeder, whereby said bobbin-case has its bearing in said peripheral groove and is prevented from urnin g, substantially as shown and described. 3. The combination, in a sewing-machine, with the stitch-forming mechanism, of a revolving hook, bobbin-case, and circular teni'sion-spring,'the former provided with a suitiable recess for the reception of thc bobbina flange upon its periphery which-has its seat in the revolving hook, the circular tension spring which fits within the bobbin-case and iavhich is provided with extensions that pass up through the opening in the edge of the obbin-case, the circular tension-spring exi tensions provided with a fold for the protec= 'tion of the thread, substantially as and for @the purposes set forth. 4. The combination, in a sewing-machine, with the stitch-forming mechanismcompris -1ing a revolving hook and feeder, said hook 's'provided with an eccentric periphery for mov- 1g the feeder in an upward and forward di-- ection, the latter provided with a spring for etracting its-forward movement, and means or adjusting said feeder vertically, substanally as'and for the purposes set forth.

5. The combination, in a sewing-machine, ith the stitch-forming mechanism comprising a revolving hook, bobbin-case, with its zsihook providedwith an eccentric periphery for moving the feeder upward and forward, said feeder provided with'a spring for retractig its forward movement, means for adjust- 1 g it vertically, and detainers, in conjunction the revolution of the bobbin-case, substam ally asand for the purposes set forth.

withthe stitch-forming mechanism, of a revolving hook having an eccentric peripher an opening 12 for the passage of the needle ijcase, a bobbin-casehaving beveled sidesand *fcircular tension-spring, and the feeder, saidj 'ith the circular tension-spring, to prevent" 6. Thecombination, in a sewing-machine,

IIO

a feeder constructed so as to be operated by In testimony that I claim the foregoing im I9 said eccentric and provided with a spring for provements in sewing-machines, as above deretracting its forward movement, the screw scribed, I have hereunto set my hand this 0, with nut a',which serves as a guide for the 29th day of August, 1889.

forward portion of the feeder, and the stud V c as a guide for the rearward portion, stud FREDRICK LICHTFELDT' 6 also constituting a bearing for the stitch- Witnesses:

regulating screw, substantially as and for the NICHOLAS TREIS,

purposes set forth. J. WIERSUM. 

